Whether it's on or off-screen, some Doctor Who companions' best stories happen after they decide to depart the TARDIS and say goodbye to their Doctor.

The search for the third segment of the Key to Time leads the Doctor and Romana to the English countryside and an ancient stone circle called the Nine Travellers.

Series 7 built up a mystery around Clara Oswald, of how the Doctor kept meeting multiple versions of her. Who was she? A trap? An old enemy? Perhaps even a Time Lord (or Time Lady, as Romana was ...

Copyright © 2025 BBC. The BBC is not responsible for the content of external sites. Read about our approach to external linking.